One of the best ways to ease into customizing is with the addition of a slip-on muffler set. These Twin Slash mufflers will give the unmistakable Vance & Hines look; open-up the performance potential of your bike and it''s ready for later engine upgrades; if desired. The low restriction louvered core baffles are pre-installed. Included are virtually invisible 3 inch full coverage heat shields which makes the 2-1/2" diameter muffler bodies blue-proof. Comes with PCX™ (Power Chamber Exhaust) technology; which integrates chambered high-flow catalysts for a tuned growl and greater boost in torque as you accelerate through the gears. - PCX™ (Power Chamber Exhaust) technology - Chambered high-flow catalyst cartridge designed to Increase torque - Full coverage heat shields - Power chamber hidden crossover Vance & Hines innovative PCX™ Technology explained: More Power & Less Heat. The PCX™ (Power Chamber Exhaust) Technology are factually chambered high-flow catalysts. Used to increase mid-range torque for more responsive acceleration off the line. They are positioned downstream for up to 20% less heat at the floorboards / foot pegs and 50% less heat at the collector; to optimize rider comfort over the stock system. PCX™ technology uses a high-flow double-matrix catalyst that improves torque delivery through the mid-range for more responsive acceleration. All while producing an even deeper full-throated rumble; all with no compromise to the styling of any Vance & Hines exhaust